87b9ba027dd06400820f51741d926fbf7bccd63d
[libav.git] / libswscale / swscale-example.c
1 /*
2 * Copyright (C) 2003 Michael Niedermayer <michaelni@gmx.at>
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <string.h>
24 #include <inttypes.h>
25 #include <stdarg.h>
26
27 #undef HAVE_AV_CONFIG_H
28 #include "libavutil/avutil.h"
29 #include "swscale.h"
30 #include "swscale_internal.h"
31
32 static uint64_t getSSD(uint8_t *src1, uint8_t *src2, int stride1, int stride2, int w, int h){
33 int x,y;
34 uint64_t ssd=0;
35
36 //printf("%d %d\n", w, h);
37
38 for (y=0; y<h; y++){
39 for (x=0; x<w; x++){
40 int d= src1[x + y*stride1] - src2[x + y*stride2];
41 ssd+= d*d;
42 //printf("%d", abs(src1[x + y*stride1] - src2[x + y*stride2])/26 );
43 }
44 //printf("\n");
45 }
46 return ssd;
47 }
48
49 // test by ref -> src -> dst -> out & compare out against ref
50 // ref & out are YV12
51 static int doTest(uint8_t *ref[3], int refStride[3], int w, int h, int srcFormat, int dstFormat,
52 int srcW, int srcH, int dstW, int dstH, int flags){
53 uint8_t *src[3];
54 uint8_t *dst[3];
55 uint8_t *out[3];
56 int srcStride[3], dstStride[3];
57 int i;
58 uint64_t ssdY, ssdU, ssdV;
59 struct SwsContext *srcContext, *dstContext, *outContext;
60 int res;
61
62 res = 0;
63 for (i=0; i<3; i++){
64 // avoid stride % bpp != 0
65 if (srcFormat==PIX_FMT_RGB24 || srcFormat==PIX_FMT_BGR24)
66 srcStride[i]= srcW*3;
67 else
68 srcStride[i]= srcW*4;
69
70 if (dstFormat==PIX_FMT_RGB24 || dstFormat==PIX_FMT_BGR24)
71 dstStride[i]= dstW*3;
72 else
73 dstStride[i]= dstW*4;
74
75 src[i]= (uint8_t*) malloc(srcStride[i]*srcH);
76 dst[i]= (uint8_t*) malloc(dstStride[i]*dstH);
77 out[i]= (uint8_t*) malloc(refStride[i]*h);
78 if (!src[i] || !dst[i] || !out[i]) {
79 perror("Malloc");
80 res = -1;
81
82 goto end;
83 }
84 }
85
86 dstContext = outContext = NULL;
87 srcContext= sws_getContext(w, h, PIX_FMT_YUV420P, srcW, srcH, srcFormat, flags, NULL, NULL, NULL);
88 if (!srcContext) {
89 fprintf(stderr, "Failed to get %s ---> %s\n",
90 sws_format_name(PIX_FMT_YUV420P),
91 sws_format_name(srcFormat));
92 res = -1;
93
94 goto end;
95 }
96 dstContext= sws_getContext(srcW, srcH, srcFormat, dstW, dstH, dstFormat, flags, NULL, NULL, NULL);
97 if (!dstContext) {
98 fprintf(stderr, "Failed to get %s ---> %s\n",
99 sws_format_name(srcFormat),
100 sws_format_name(dstFormat));
101 res = -1;
102
103 goto end;
104 }
105 outContext= sws_getContext(dstW, dstH, dstFormat, w, h, PIX_FMT_YUV420P, flags, NULL, NULL, NULL);
106 if (!outContext) {
107 fprintf(stderr, "Failed to get %s ---> %s\n",
108 sws_format_name(dstFormat),
109 sws_format_name(PIX_FMT_YUV420P));
110 res = -1;
111
112 goto end;
113 }
114 // printf("test %X %X %X -> %X %X %X\n", (int)ref[0], (int)ref[1], (int)ref[2],
115 // (int)src[0], (int)src[1], (int)src[2]);
116
117 sws_scale(srcContext, ref, refStride, 0, h , src, srcStride);
118 sws_scale(dstContext, src, srcStride, 0, srcH, dst, dstStride);
119 sws_scale(outContext, dst, dstStride, 0, dstH, out, refStride);
120
121 ssdY= getSSD(ref[0], out[0], refStride[0], refStride[0], w, h);
122 ssdU= getSSD(ref[1], out[1], refStride[1], refStride[1], (w+1)>>1, (h+1)>>1);
123 ssdV= getSSD(ref[2], out[2], refStride[2], refStride[2], (w+1)>>1, (h+1)>>1);
124
125 if (srcFormat == PIX_FMT_GRAY8 || dstFormat==PIX_FMT_GRAY8) ssdU=ssdV=0; //FIXME check that output is really gray
126
127 ssdY/= w*h;
128 ssdU/= w*h/4;
129 ssdV/= w*h/4;
130
131 printf(" %s %dx%d -> %s %4dx%4d flags=%2d SSD=%5lld,%5lld,%5lld\n",
132 sws_format_name(srcFormat), srcW, srcH,
133 sws_format_name(dstFormat), dstW, dstH,
134 flags, ssdY, ssdU, ssdV);
135 fflush(stdout);
136
137 end:
138
139 sws_freeContext(srcContext);
140 sws_freeContext(dstContext);
141 sws_freeContext(outContext);
142
143 for (i=0; i<3; i++){
144 free(src[i]);
145 free(dst[i]);
146 free(out[i]);
147 }
148
149 return res;
150 }
151
152 static void selfTest(uint8_t *src[3], int stride[3], int w, int h){
153 enum PixelFormat srcFormat, dstFormat;
154 int srcW, srcH, dstW, dstH;
155 int flags;
156
157 for (srcFormat = 0; srcFormat < PIX_FMT_NB; srcFormat++) {
158 for (dstFormat = 0; dstFormat < PIX_FMT_NB; dstFormat++) {
159 printf("%s -> %s\n",
160 sws_format_name(srcFormat),
161 sws_format_name(dstFormat));
162 fflush(stdout);
163
164 srcW= w;
165 srcH= h;
166 for (dstW=w - w/3; dstW<= 4*w/3; dstW+= w/3){
167 for (dstH=h - h/3; dstH<= 4*h/3; dstH+= h/3){
168 for (flags=1; flags<33; flags*=2) {
169 int res;
170
171 res = doTest(src, stride, w, h, srcFormat, dstFormat,
172 srcW, srcH, dstW, dstH, flags);
173 if (res < 0) {
174 dstW = 4 * w / 3;
175 dstH = 4 * h / 3;
176 flags = 33;
177 }
178 }
179 }
180 }
181 }
182 }
183 }
184
185 #define W 96
186 #define H 96
187
188 int main(int argc, char **argv){
189 uint8_t *rgb_data = malloc (W*H*4);
190 uint8_t *rgb_src[3]= {rgb_data, NULL, NULL};
191 int rgb_stride[3]={4*W, 0, 0};
192 uint8_t *data = malloc (3*W*H);
193 uint8_t *src[3]= {data, data+W*H, data+W*H*2};
194 int stride[3]={W, W, W};
195 int x, y;
196 struct SwsContext *sws;
197
198 sws= sws_getContext(W/12, H/12, PIX_FMT_RGB32, W, H, PIX_FMT_YUV420P, 2, NULL, NULL, NULL);
199
200 for (y=0; y<H; y++){
201 for (x=0; x<W*4; x++){
202 rgb_data[ x + y*4*W]= random();
203 }
204 }
205 sws_scale(sws, rgb_src, rgb_stride, 0, H, src, stride);
206
207 selfTest(src, stride, W, H);
208
209 return 123;
210 }